/*
 *  Document:         Whets.c
 *  File Group:       Classic Benchmarks
 *  Creation Date:    6 November 1996
 *  Revision Date:
 *
 *  Title:            Whetstone Benchmark in C/C++
 *  Keywords:         WHETSTONE BENCHMARK PERFORMANCE MIPS
 *                    MWIPS MFLOPS
 *
 *  Abstract:         C or C++ version of Whetstone one of the
 *                    Classic Numeric Benchmarks with example
 *                    results on P3 to P6 based PCs.
 *
 *  Contributor:      Roy Longbottom 101323.2241@compuserve.com
    *                         or     Roy_Longbottom@compuserve.com
 *
 ************************************************************
 *
 *     C/C++ Whetstone Benchmark Single or Double Precision
 *
 *     Original concept        Brian Wichmann NPL      1960's
 *     Original author         Harold Curnow  CCTA     1972
 *     Self timing versions    Roy Longbottom CCTA     1978/87
 *     Optimisation control    Bangor University       1987/90
 *     C/C++ Version           Roy Longbottom          1996
 *     Compatibility & timers  Al Aburto               1996
 *
 ************************************************************
 *
 *              Official version approved by:
 *
 *         Harold Curnow  100421.1615@compuserve.com
 *
 *      Happy 25th birthday Whetstone, 21 November 1997
 *
 ************************************************************
 *
 *     The program normally runs for about 100 seconds
 *     (adjustable in main - variable duration). This time
 *     is necessary because of poor PC clock resolution.
 *     The original concept included such things as a given
 *     number of subroutine calls and divides which may be
 *     changed by optimisation. For comparison purposes the
 *     compiler and level of optimisation should be identified.
 *
 ************************************************************
 *
 *     The original benchmark had a single variable I which
 *     controlled the running time. Constants with values up
 *     to 899 were multiplied by I to control the number
 *     passes for each loop. It was found that large values
 *     of I could overflow index registers so an extra outer
 *     loop with a second variable J was added.
 *
 *     Self timing versions were produced during the early
 *     days. The 1978 changes supplied timings of individual
 *     loops and these were used later to produce MFLOPS and
 *     MOPS ratings.
 *
 *     1987 changes converted the benchmark to Fortran 77
 *     standards and removed redundant IF statements and
 *     loops to leave the 8 active loops N1 to N8. Procedure
 *     P3 was changed to use global variables to avoid over-
 *     optimisation with the first two statements changed from
 *     X1=X and Y1=Y to X=Y and Y=Z. A self time calibrating
 *     version for PCs was also produced, the facility being
 *     incorporated in this version.
 *
 *     This version has changes to avoid worse than expected
 *     speed ratings, due to underflow, and facilities to show
 *     that consistent numeric output is produced with varying
 *     optimisation levels or versions in different languages.
 *
 *     Some of the procedures produce ever decreasing numbers.
 *     To avoid problems, variables T and T1 have been changed
 *     from 0.499975 and 0.50025 to 0.49999975 and 0.50000025.
 *
 *     Each section now has its own double loop. Inner loops
 *     are run 100 times the loop constants. Calibration
 *     determines the number of outer loop passes. The
 *     numeric results produced in the main output are for
 *     one pass on the outer loop. As underflow problems were
 *     still likely on a processor 100 times faster than a 100
 *     MHz Pentium, three sections have T=1.0-T inserted in the
 *     outer loop to avoid the problem. The two loops avoid
 *     index register overflows.
 *
 *     The first section is run ten times longer than required
 *     for accuracy in calculating MFLOPS. This time is divided
 *     by ten for inclusion in the MWIPS calculations.
 *
 *     This version has facilities for typing in details of the
 *     particular run. This information is appended to file
 *     whets.res along with the results.
 *
 *     Roy Longbottom  101323.2241@compuserve.com
 *
 ************************************************************
 *
 *     Whetstone benchmark results are available in whets.tbl
 *     from ftp.nosc.mil/pub/aburto. The results include
 *     further details of the benchmarks.
 *
 ************************************************************
 *
 *     Source code is available in C/C++, Fortran, Basic and
 *     Visual Basic in the same format as this version. Pre-
 *     compiled versions for PCs are also available via C++.
 *     These comprise optimised and non-optimised versions
 *     for DOS, Windows and NT.
 *
 *     This version compiles and runs correctly either as a
 *     C or CPP program with a WATCOM and Borland compiler.
 *
 ************************************************************
 *
 * Example of initial calibration display (Pentium 100 MHz)
 *
 * Single Precision C/C++ Whetstone Benchmark
 *
 * Calibrate
 *      0.17 Seconds          1   Passes (x 100)
 *      0.77 Seconds          5   Passes (x 100)
 *      3.70 Seconds         25   Passes (x 100)
 *
 * Use 676  passes (x 100)
 *
 * 676 passes are used for an approximate duration of 100
 * seconds, providing an initial estimate of a speed rating
 * of 67.6 MWIPS.
 *
 * This is followed by the table of results as below. Input
 * statements are then supplied to type in the run details.
 *
 ************************************************************
 *
 * Examples of results from file whets.res
 *
 * Whetstone Single  Precision Benchmark in C/C++
 *
 * Month run         4/1996
 * PC model          Escom
 * CPU               Pentium
 * Clock MHz         100
 * Cache             256K
 * H/W Options       Neptune chipset
 * OS/DOS            Windows 95
 * Compiler          Watcom C/C++ 10.5  Win386
 * Options           No optimisation
 * Run by            Roy Longbottom
 * From              UK
 * Mail              101323.2241@compuserve.com
 *
 * Loop content                 Result            MFLOPS     MOPS   Seconds
 *
 * N1 floating point    -1.12475025653839100      19.971              0.274
 * N2 floating point    -1.12274754047393800      11.822              3.240
 * N3 if then else       1.00000000000000000               11.659     2.530
 * N4 fixed point       12.00000000000000000               13.962     6.430
 * N5 sin,cos etc.       0.49904659390449520                2.097    11.310
 * N6 floating point     0.99999988079071040       3.360             45.750
 * N7 assignments        3.00000000000000000                2.415    21.810
 * N8 exp,sqrt etc.      0.75110864639282230                1.206     8.790
 *
 * MWIPS                                          28.462            100.134
 *
 * Whetstone Single  Precision Benchmark in C/C++
 *
 * Compiler          Watcom C/C++ 10.5  Win386
 * Options           -otexan -zp4 -om -fp5 -5r
 *
 * Loop content                 Result            MFLOPS     MOPS    Seconds
 *
 * N1 floating point    -1.12475025653839100      26.751               0.478
 * N2 floating point    -1.12274754047393800      17.148               5.220
 * N3 if then else       1.00000000000000000               19.922      3.460
 * N4 fixed point       12.00000000000000000               15.978     13.130
 * N5 sin,cos etc.       0.49904659390449520                2.663     20.810
 * N6 floating point     0.99999988079071040      10.077              35.650
 * N7 assignments        3.00000000000000000               22.877      5.380
 * N8 exp,sqrt etc.      0.75110864639282230                1.513     16.370
 *
 * MWIPS                                          66.270             100.498
 *
 *
 * Whetstone Double  Precision Benchmark in C/C++
 *
 * Compiler          Watcom C/C++ 10.5 Win32NT
 * Options           -otexan -zp4 -om -fp5 -5r
 *
 * Loop content                 Result           MFLOPS      MOPS   Seconds
 *
 * N1 floating point    -1.12398255667391900     26.548               0.486
 * N2 floating point    -1.12187079889284400     16.542               5.460
 * N3 if then else       1.00000000000000000               19.647     3.540
 * N4 fixed point       12.00000000000000000               15.680    13.500
 * N5 sin,cos etc.       0.49902937281515140                3.019    18.520
 * N6 floating point     0.99999987890802820      9.977              36.330
 * N7 assignments        3.00000000000000000               22.620     5.490
 * N8 exp,sqrt etc.      0.75100163018457870                1.493    16.740
 *
 * MWIPS                                         67.156             100.066
 *
 *  Note different numeric results to single precision. Slight variations
 *  are normal with different compilers and sometimes optimisation levels.
 *
 **************************************************************************
 *
 *       Example results via Watcom C/C++ 10.5 Win386 (P6 Win32NT)
 *
 *
 *            Single Precision Non-optimised Results -dMSC
 *
 *     MWIPS   MFLOPS  MFLOPS  MFLOPS  COS     EXP     FIXPT   IF     EQUAL
 * Key           1       2       3     MOPS    MOPS    MOPS    MOPS    MOPS
 *
 * P3  3.07    0.860   0.815   0.328   0.355   0.160   1.70    1.32   0.264
 * P4  10.0    4.68    3.51    1.27    0.482   0.298   5.73    5.20    1.18
 * P5  28.5    20.0    11.8    3.36    2.10    1.21    14.0    11.7    2.42
 * P6  81.7    47.5    37.8    10.9    3.91    2.43    51.2    42.8    7.85
 *
 *
 *    Single Precision Optimised Results -otexan -zp4 -om -fp5 -5r -dMSC
 *
 *     MWIPS   MFLOPS  MFLOPS  MFLOPS  COS     EXP     FIXPT   IF     EQUAL
 * Key           1       2       3     MOPS    MOPS    MOPS    MOPS    MOPS
 *
 * P3  5.68    0.928   0.884   0.673   0.461   0.275   2.36    2.16   0.638
 * P4  16.4    5.09    4.03    2.66    0.526   0.342   6.36    6.00    5.28
 * P5  66.3    26.8    17.1    10.1    2.66    1.51    16.0    19.9    22.9
 * P6  161     50.3    45.2    31.5    4.46    2.77    102     20.6    119
 *
 *
 *  Double Precision Optimised Results -otexan -zp4 -om -fp5 -5r -dMSC -dDP
 *
 *     MWIPS   MFLOPS  MFLOPS  MFLOPS  COS     EXP     FIXPT   IF     EQUAL
 * Key           1       2       3     MOPS    MOPS    MOPS    MOPS    MOPS
 *
 * P3  5.20    0.818   0.775   0.604   0.525   0.268   2.20    2.05   0.538
 * P4  16.5    4.74    3.76    2.51    0.627   0.343   6.22    6.45    4.09
 * P5  67.9    26.9    16.7    10.1    3.06    1.51    15.8    19.9    22.8
 * P6  167     50.3    43.5    31.5    5.37    2.83    81.3    20.6    119
 *
 *
 *                             Systems
 *
 * Key System       CPU     MHz   Cache    Options          OS
 *
 * P3  Clone     AM80386DX  40    128K   with 387        Windows 95
 * P4  Escom,    80486DX2   66.7  128K   CIS chipset     Windows 95
 * P5  Escom,    Pentium   100    256K   Neptune chipset Windows 95
 * P6  Dell Pro  PentPro   200    256K   440FX PCIset    NT 3.51
 *
 **************************************************************************
 *
 *                       Running Instructions
 *
 *      1.  In order to compile successfully, include timer option as
 *          indicated below.
 *      2.  If pre-compiled codes are to be distributed, compile with the
 *          -DPRECOMP option or uncomment #define PRECOMP at PRECOMPILE
 *          below. Also insert compiler name and optimisation details
 *          at #define precompiler and #define preoptions.
 *      3.  Compile and run for single precision results
 *      4.  Compile with -DDP option or uncomment #define DP at PRECISION
 *          below and run for double precision results.
 *      5.  Run with maximum and no optimisation (minimum debug)
 *      6.  Notify Roy Longbottom of other necessary changes
 *      7.  Send results file whets.res to Roy Longbottom - with one
 *          sample of each run and system details fully completed
 *
 *      Roy Longbottom  101323.2241@compuserve.com    6 November 1996
 *
 **************************************************************************
 */

 #include <math.h>       /* for sin, exp etc.           */
 #include <stdio.h>      /* standard I/O                */
 #include <string.h>     /* for strcpy - 3 occurrences  */
 #include <stdlib.h>     /* for exit   - 1 occurrence   */
#include  <os.h>

/***************************************************************/
/* Timer options. You MUST uncomment one of the options below  */
/* or compile, for example, with the '-DUNIX' option.          */
/***************************************************************/
/* #define Amiga       */
/* #define UNIX        */
/* #define UNIX_Old    */
/* #define VMS         */
/* #define BORLAND_C   */
/* #define MSC         */
/* #define MAC         */
/* #define IPSC        */
/* #define FORTRAN_SEC */
/* #define GTODay      */
/* #define CTimer      */
/* #define UXPM        */
/* #define MAC_TMgr    */
/* #define PARIX       */
/* #define POSIX       */
/* #define WIN32       */
#define DJYOS


/*PRECISION PRECISION PRECISION PRECISION PRECISION PRECISION PRECISION*/

 /* #define DP */

 #ifdef DP
    #define SPDP double
    #define Precision "Double"
 #else
    #define SPDP float
    #define Precision "Single"
 #endif


/*PRECOMPILE  PRECOMPILE  PRECOMPILE  PRECOMPILE  PRECOMPILE  PRECOMPILE*/

 /* #define PRECOMP */

 #ifdef PRECOMP
    #define precompiler "INSERT COMPILER NAME HERE"
    #define preoptions  "INSERT OPTIMISATION OPTIONS HERE"
 #endif

 int WhetStoneTest(void);
 void whetstones(long xtra, long x100, int calibrate);
 void pa(SPDP e[4], SPDP t, SPDP t2);
 void po(SPDP e1[4], long j, long k, long l);
 void p3(SPDP *x, SPDP *y, SPDP *z, SPDP t, SPDP t1, SPDP t2);
 void pout(char title[22], float ops, int type, SPDP checknum,
                  SPDP time, int calibrate, int section);


 static SPDP loop_time[9];
 static SPDP loop_mops[9];
 static SPDP loop_mflops[9];
 static SPDP TimeUsed;
 static SPDP mwips;
 static char headings[9][18];
 static SPDP Check;
 static SPDP results[9];

int WhetStoneTest(void)
{
    int count = 10, calibrate = 1;
    long xtra = 1;
    int section;
    long x100 = 100;
    int duration = 100;
    FILE *outfile;
    char compiler[80], options[256], general[10][80] = {" "};
    char *endit;

    printf("\r\n");
    printf(" ***************** WHETSTONE TEST START ***************** \r\n");
    printf("%s Precision C/C++ Whetstone Benchmark\r\n", Precision);

    printf("Calibrate\r\n");
    do
    {
        TimeUsed=0;

        whetstones(xtra,x100,calibrate);

        printf("%11.2f Seconds %10.0lf   Passes (x 100)\r\n",
                                     TimeUsed,(SPDP)(xtra));
        calibrate++;
        count--;

        if (TimeUsed > 2.0)
        {
            count = 0;
        }
        else
        {
            xtra = xtra * 5;
        }
    }while (count > 0);

    if (TimeUsed > 0) xtra = (long)((SPDP)(duration * xtra) / TimeUsed);
    if (xtra < 1) xtra = 1;

    calibrate = 0;

    printf("\r\nUse %ld  passes (x 100)\r\n", xtra);

    printf("\r\n          %s Precision C/C++ Whetstone Benchmark",Precision);

    #ifdef PRECOMP
      printf("\r\n          Compiler  %s", precompiler);
      printf("\r\n          Options   %s\n", preoptions);
    #else
      printf("\r\n");
    #endif

    printf("\r\nLoop content                  Result              MFLOPS "
                                "     MOPS   Seconds\r\n\r\n");

    TimeUsed=0;
    whetstones(xtra,x100,calibrate);

    printf("\r\nMWIPS            ");
    if (TimeUsed>0)
    {
        mwips=(float)(xtra) * (float)(x100) / (10 * TimeUsed);
    }
    else
    {
        mwips = 0;
    }

    printf("%39.3f%19.3f\n\n",mwips,TimeUsed);

    if (Check == 0) printf("Wrong answer  ");

    printf ("\r\n");
    printf(" ***************** WHETSTONE TEST END ***************** \r\n");

}

void whetstones(long xtra, long x100, int calibrate)
{

    long n1,n2,n3,n4,n5,n6,n7,n8,i,ix,n1mult;
    SPDP x,y,z;
    long j,k,l;
    SPDP e1[4],timea,timeb, dtime();

    SPDP t =  0.49999975;
    SPDP t0 = t;
    SPDP t1 = 0.50000025;
    SPDP t2 = 2.0;

    Check=0.0;

    n1 = 12*x100;
    n2 = 14*x100;
    n3 = 345*x100;
    n4 = 210*x100;
    n5 = 32*x100;
    n6 = 899*x100;
    n7 = 616*x100;
    n8 = 93*x100;
    n1mult = 10;

    /* Section 1, Array elements */

    e1[0] = 1.0;
    e1[1] = -1.0;
    e1[2] = -1.0;
    e1[3] = -1.0;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0; i<n1*n1mult; i++)
              {
                  e1[0] = (e1[0] + e1[1] + e1[2] - e1[3]) * t;
                  e1[1] = (e1[0] + e1[1] - e1[2] + e1[3]) * t;
                  e1[2] = (e1[0] - e1[1] + e1[2] + e1[3]) * t;
                  e1[3] = (-e1[0] + e1[1] + e1[2] + e1[3]) * t;
              }
            t = 1.0 - t;
          }
        t =  t0;
     }
    timeb = (dtime()-timea)/(SPDP)(n1mult);
    pout("N1 floating point\0",(float)(n1*16)*(float)(xtra),
                         1,e1[3],timeb,calibrate,1);

    /* Section 2, Array as parameter */

    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0; i<n2; i++)
              {
                 pa(e1,t,t2);
              }
            t = 1.0 - t;
          }
        t =  t0;
     }
    timeb = dtime()-timea;
    pout("N2 floating point\0",(float)(n2*96)*(float)(xtra),
                         1,e1[3],timeb,calibrate,2);

    /* Section 3, Conditional jumps */
    j = 1;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0; i<n3; i++)
              {
                 if(j==1)       j = 2;
                 else           j = 3;
                 if(j>2)        j = 0;
                 else           j = 1;
                 if(j<1)        j = 1;
                 else           j = 0;
              }
          }
     }
    timeb = dtime()-timea;
    pout("N3 if then else  \0",(float)(n3*3)*(float)(xtra),
                    2,(SPDP)(j),timeb,calibrate,3);

    /* Section 4, Integer arithmetic */
    j = 1;
    k = 2;
    l = 3;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0; i<n4; i++)
              {
                 j = j *(k-j)*(l-k);
                 k = l * k - (l-j) * k;
                 l = (l-k) * (k+j);
                 e1[l-2] = j + k + l;
                 e1[k-2] = j * k * l;
              }
          }
     }
    timeb = dtime()-timea;
    x = e1[0]+e1[1];
    pout("N4 fixed point   \0",(float)(n4*15)*(float)(xtra),
                             2,x,timeb,calibrate,4);

    /* Section 5, Trig functions */
    x = 0.5;
    y = 0.5;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=1; i<n5; i++)
              {
                 x = t*atan(t2*sin(x)*cos(x)/(cos(x+y)+cos(x-y)-1.0));
                 y = t*atan(t2*sin(y)*cos(y)/(cos(x+y)+cos(x-y)-1.0));
              }
            t = 1.0 - t;
          }
        t = t0;
     }
    timeb = dtime()-timea;
    pout("N5 sin,cos etc.  \0",(float)(n5*26)*(float)(xtra),
                             2,y,timeb,calibrate,5);

    /* Section 6, Procedure calls */
    x = 1.0;
    y = 1.0;
    z = 1.0;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0; i<n6; i++)
              {
                 p3(&x,&y,&z,t,t1,t2);
              }
          }
     }
    timeb = dtime()-timea;
    pout("N6 floating point\0",(float)(n6*6)*(float)(xtra),
                            1,z,timeb,calibrate,6);

    /* Section 7, Array refrences */
    j = 0;
    k = 1;
    l = 2;
    e1[0] = 1.0;
    e1[1] = 2.0;
    e1[2] = 3.0;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0;i<n7;i++)
              {
                 po(e1,j,k,l);
              }
          }
     }
    timeb = dtime()-timea;
    pout("N7 assignments   \0",(float)(n7*3)*(float)(xtra),
                        2,e1[2],timeb,calibrate,7);

    /* Section 8, Standard functions */
    x = 0.75;
    timea = dtime();
     {
        for (ix=0; ix<xtra; ix++)
          {
            for(i=0; i<n8; i++)
              {
                 x = sqrt(exp(log(x)/t1));
              }
          }
     }
    timeb = dtime()-timea;
    pout("N8 exp,sqrt etc. \0",(float)(n8*4)*(float)(xtra),
                            2,x,timeb,calibrate,8);

    return;
}


void pa(SPDP e[4], SPDP t, SPDP t2)
{
    long j;
    for(j=0;j<6;j++)
    {
       e[0] = (e[0]+e[1]+e[2]-e[3])*t;
       e[1] = (e[0]+e[1]-e[2]+e[3])*t;
       e[2] = (e[0]-e[1]+e[2]+e[3])*t;
       e[3] = (-e[0]+e[1]+e[2]+e[3])/t2;
    }

    return;
}

void po(SPDP e1[4], long j, long k, long l)
{
    e1[j] = e1[k];
    e1[k] = e1[l];
    e1[l] = e1[j];
    return;
}

void p3(SPDP *x, SPDP *y, SPDP *z, SPDP t, SPDP t1, SPDP t2)
{
    *x = *y;
    *y = *z;
    *x = t * (*x + *y);
    *y = t1 * (*x + *y);
    *z = (*x + *y)/t2;
    return;
}


void pout(char title[18], float ops, int type, SPDP checknum,
      SPDP time, int calibrate, int section)
{
    SPDP mops,mflops;

    Check = Check + checknum;
    loop_time[section] = time;
    strcpy (headings[section],title);
    TimeUsed =  TimeUsed + time;
    if (calibrate == 1)
    {
        results[section] = checknum;
    }
    if (calibrate == 0)
    {
        printf("%s %24.17f    ",headings[section],results[section]);

        if (type == 1)
        {
            if (time>0)
            {
                mflops = ops/(1000000L*time);
            }
            else
            {
                mflops = 0;
            }
            loop_mops[section] = 99999;
            loop_mflops[section] = mflops;
            printf(" %9.3f          %9.3f\r\n",
            loop_mflops[section], loop_time[section]);
        }
        else
        {
            if (time>0)
            {
                mops = ops/(1000000L*time);
            }
            else
            {
                mops = 0;
            }
            loop_mops[section] = mops;
            loop_mflops[section] = 0;
            printf("           %9.3f%9.3f\r\n",
            loop_mops[section], loop_time[section]);
        }
    }
    return;
}


/*****************************************************/
/* Various timer routines.                           */
/* Al Aburto, aburto@nosc.mil, 08 Oct 1996           */
/*                                                   */
/* t = dtime() outputs the current time in seconds.  */
/* Use CAUTION as some of these routines will mess   */
/* up when timing across the hour mark!!!            */
/*                                                   */
/* For timing I use the 'user' time whenever         */
/* possible. Using 'user+sys' time is a separate     */
/* issue.                                            */
/*                                                   */
/* Example Usage:                                    */
/* [timer options added here]                        */
/* main()                                            */
/* {                                                 */
/*  double starttime,benchtime,dtime();              */
/*                                                   */
/*  starttime = dtime();                             */
/*  [routine to time]                                */
/*  benchtime = dtime() - starttime;                 */
/* }                                                 */
/*                                                   */
/* [timer code below added here]                     */
/*****************************************************/

/*********************************/
/* Timer code.                   */
/*********************************/
/*******************/
/*  Amiga dtime()  */
/*******************/
#ifdef Amiga
#include <ctype.h>
#define HZ 50

SPDP dtime()
{
 SPDP q;

 struct tt
       {
        long  days;
        long  minutes;
        long  ticks;
       } tt;

 DateStamp(&tt);

 q = ((SPDP)(tt.ticks + (tt.minutes * 60L * 50L))) / (SPDP)HZ;

 return q;
}
#endif

/*****************************************************/
/*  UNIX dtime(). This is the preferred UNIX timer.  */
/*  Provided by: Markku Kolkka, mk59200@cc.tut.fi    */
/*  HP-UX Addition by: Bo Thide', bt@irfu.se         */
/*****************************************************/
#ifdef UNIX
#include <sys/time.h>
#include <sys/resource.h>

#ifdef hpux
#include <sys/syscall.h>
#define getrusage(a,b) syscall(SYS_getrusage,a,b)
#endif

struct rusage rusage;

SPDP dtime()
{
 SPDP q;

 getrusage(RUSAGE_SELF,&rusage);

 q = (SPDP)(rusage.ru_utime.tv_sec);
 q = q + (SPDP)(rusage.ru_utime.tv_usec) * 1.0e-06;

 return q;
}
#endif

/***************************************************/
/*  UNIX_Old dtime(). This is the old UNIX timer.  */
/*  Use only if absolutely necessary as HZ may be  */
/*  ill defined on your system.                    */
/***************************************************/
#ifdef UNIX_Old
#include <sys/types.h>
#include <sys/times.h>
#include <sys/param.h>

#ifndef HZ
#define HZ 60
#endif

struct tms tms;

SPDP dtime()
{
 SPDP q;

 times(&tms);

 q = (SPDP)(tms.tms_utime) / (SPDP)HZ;

 return q;
}
#endif

/*********************************************************/
/*  VMS dtime() for VMS systems.                         */
/*  Provided by: RAMO@uvphys.phys.UVic.CA                */
/*  Some people have run into problems with this timer.  */
/*********************************************************/
#ifdef VMS
#include time

#ifndef HZ
#define HZ 100
#endif

struct tbuffer_t
       {
        int proc_user_time;
        int proc_system_time;
        int child_user_time;
        int child_system_time;
       };
struct tbuffer_t tms;

SPDP dtime()
{
 SPDP q;

 times(&tms);

 q = (SPDP)(tms.proc_user_time) / (SPDP)HZ;

 return q;
}
#endif

/******************************/
/*  BORLAND C dtime() for DOS */
/******************************/
#ifdef BORLAND_C
#include <ctype.h>
#include <dos.h>
#include <time.h>

#define HZ 100
struct time tnow;

SPDP dtime()
{
 SPDP q;

 gettime(&tnow);

 q = 60.0 * (SPDP)(tnow.ti_min);
 q = q + (SPDP)(tnow.ti_sec);
 q = q + (SPDP)(tnow.ti_hund)/(SPDP)HZ;

 return q;
}
#endif

/***************************************/
/*  Microsoft C (MSC) dtime() for DOS  */
/*  Also suitable for Watcom C/C++ and */
/*  some other PC compilers            */
/***************************************/
#ifdef MSC
#include <time.h>
#include <ctype.h>

#define HZ CLOCKS_PER_SEC
clock_t tnow;

SPDP dtime()
{
 SPDP q;

 tnow = clock();
 q = (SPDP)tnow / (SPDP)HZ;
 return q;
}
#endif

/*************************************/
/*  Macintosh (MAC) Think C dtime()  */
/*************************************/
#ifdef MAC
#include <time.h>

#define HZ 60

SPDP dtime()
{
 SPDP q;

 q = (SPDP)clock() / (SPDP)HZ;

 return q;
}
#endif

/************************************************************/
/*  iPSC/860 (IPSC) dtime() for i860.                       */
/*  Provided by: Dan Yergeau, yergeau@gloworm.Stanford.EDU  */
/************************************************************/
#ifdef IPSC
extern double dclock();

SPDP dtime()
{
 SPDP q;

 q = dclock();

 return q;
}
#endif

/**************************************************/
/*  FORTRAN dtime() for Cray type systems.        */
/*  This is the preferred timer for Cray systems. */
/**************************************************/
#ifdef FORTRAN_SEC

fortran double second();

SPDP dtime()
{
 SPDP q;

 second(&q);

 return q;
}
#endif

/***********************************************************/
/*  UNICOS C dtime() for Cray UNICOS systems.  Don't use   */
/*  unless absolutely necessary as returned time includes  */
/*  'user+system' time.  Provided by: R. Mike Dority,      */
/*  dority@craysea.cray.com                                */
/***********************************************************/
#ifdef CTimer
#include <time.h>

SPDP dtime()
{
 SPDP q;
 clock_t   clock(void);

 q = (SPDP)clock() / (SPDP)CLOCKS_PER_SEC;

 return q;
}
#endif

/********************************************/
/* Another UNIX timer using gettimeofday(). */
/* However, getrusage() is preferred.       */
/********************************************/
#ifdef GTODay
#include <sys/time.h>

struct timeval tnow;

SPDP dtime()
{
 SPDP q;

 gettimeofday(&tnow,NULL);
 q = (SPDP)tnow.tv_sec + (SPDP)tnow.tv_usec * 1.0e-6;

 return q;
}
#endif

/*****************************************************/
/*  Fujitsu UXP/M timer.                             */
/*  Provided by: Mathew Lim, ANUSF, M.Lim@anu.edu.au */
/*****************************************************/
#ifdef UXPM
#include <sys/types.h>
#include <sys/timesu.h>
struct tmsu rusage;

SPDP dtime()
{
 SPDP q;

 timesu(&rusage);

 q = (SPDP)(rusage.tms_utime) * 1.0e-06;

 return q;
}
#endif

/**********************************************/
/*    Macintosh (MAC_TMgr) Think C dtime()    */
/*   requires Think C Language Extensions or  */
/*    #include <MacHeaders> in the prefix     */
/*  provided by Francis H Schiffer 3rd (fhs)  */
/*         skipschiffer@genie.geis.com        */
/**********************************************/
#ifdef MAC_TMgr
#include <Timer.h>
#include <stdlib.h>

static TMTask   mgrTimer;
static Boolean  mgrInited = false;
static SPDP     mgrClock;

#define RMV_TIMER RmvTime( (QElemPtr)&mgrTimer )
#define MAX_TIME  1800000000L
/* MAX_TIME limits time between calls to */
/* dtime( ) to no more than 30 minutes   */
/* this limitation could be removed by   */
/* creating a completion routine to sum  */
/* 30 minute segments (fhs 1994 feb 9)   */

static void Remove_timer( )
{
 RMV_TIMER;
 mgrInited = false;
}

SPDP dtime( )
{
 if( mgrInited ) {
        RMV_TIMER;
        mgrClock += (MAX_TIME + mgrTimer.tmCount)*1.0e-6;
 } else {
        if( _atexit( &Remove_timer ) == 0 ) mgrInited = true;
        mgrClock = 0.0;
}
        if( mgrInited ) {
                mgrTimer.tmAddr = NULL;
                mgrTimer.tmCount = 0;
                mgrTimer.tmWakeUp = 0;
                mgrTimer.tmReserved = 0;
                InsTime( (QElemPtr)&mgrTimer );
                PrimeTime( (QElemPtr)&mgrTimer, -MAX_TIME );
        }
        return( mgrClock );
}
#endif

/***********************************************************/
/*  Parsytec GCel timer.                                   */
/*  Provided by: Georg Wambach, gw@informatik.uni-koeln.de */
/***********************************************************/
#ifdef PARIX
#include <sys/time.h>

SPDP dtime()
{
 SPDP q;

 q = (SPDP) (TimeNowHigh()) / (SPDP) CLK_TCK_HIGH;

 return q;
}
#endif

/************************************************/
/*  Sun Solaris POSIX dtime() routine           */
/*  Provided by: Case Larsen, CTLarsen.lbl.gov  */
/************************************************/
#ifdef POSIX
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/rusage.h>

#ifdef __hpux
#include <sys/syscall.h>
#endif

struct rusage rusage;

SPDP dtime()
{
 SPDP q;

 getrusage(RUSAGE_SELF,&rusage);

 q = (SPDP)(rusage.ru_utime.tv_sec);
 q = q + (SPDP)(rusage.ru_utime.tv_nsec) * 1.0e-09;

 return q;
}
#endif


/****************************************************/
/*  Windows NT (32 bit) dtime() routine             */
/*  Provided by: Piers Haken, piersh@microsoft.com  */
/****************************************************/
#ifdef WIN32
#include <windows.h>

SPDP dtime(void)
{
 SPDP q;

 q = (SPDP)GetTickCount() * 1.0e-03;

 return q;
}
#endif

/****************************************************/
/*  DJYOS (32 bit) dtime() routine             */
/*  Provided by: Piers Haken, piersh@microsoft.com  */
/****************************************************/
#ifdef DJYOS
#include <os.h>

SPDP dtime(void)
{
    SPDP q;

    q = (SPDP)DJY_GetSysTime() * 1.0e-06;

    return q;
}
#endif
